Tribological behaviour of LM25 hybrid metal matrix composites by using Taguchi’s techniques

Abstract

In the competitive industrial world, the composite materials have vast scope due to its mechanical and wear characteristics like strength, hardness, toughness, wear in micron and coefficient of friction. Conventional monolithic general materials have limitations concerning recently advanced materials like composite as well as Hybrid composite materials. The innovation of hybrid metal matrix composite has become an exciting task in material science and metallurgy. Aluminum alloy composites are primarily utilized in the car and the aerospace industry due to their excellent mechanical characteristics, including greater stiffness, low density, excellentcorrosion resistance, and significant wear resistance. So in the present research, Wear and frictional characteristics of aluminum alloy-based hybrid composite material has been investigated with the help of tribometer testing apparatus. Tribological behavior of LM25 reinforced with Fly ash and Alumina with a varying percentage from 4%, 8%, 12% manufactured with stir casting technique and studied. The study was planned on Taguchi's approach, and the L9 array has been used for experimentation. In this research, experiments were conducted as per ASTM-G99 standard and with pin-on-disk (POD) tribo testing machine for characterization of Hybrid metal matrix composite. The speed of disc has the most significant impact, on the wear in micron after that the Normal loads and the reinforcement percentage. The reinforcement percentage shows more effect on coefficient of friction in hybrid composite material. The SEM images shows that abrasive wear of Hybrid composite material occur during Sliding wear of specimen on Pin-on-disc apparatus. The validation of results was done with the help of SEM (Scanning Electron Microscope) studies with the experimental results.